// 返回上一页
let u = navigator.userAgent;
let isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/);
export  function backpage(){
    if(isiOS){
        window.webkit.messageHandlers.CloseWebView.postMessage({});
    }else{
        window.android.CloseWebView();
    }
}